Manual.rst: update documentation after refactor 'extension/qfq/qfq/...' to 'extension/Source/core/...'. Fixed outdated mail.log statement.

Manual.rst: several places where the bs-column description are updated with the new way 'col-md-...' instead of '12'

Manual.rst: Replace ''{{pageId' with '{{pageAlias'. Replace '... AS _Page' by '... AS _page'. Add 'tablesorter tablesorter-filter' to FormEditor example page.

Fixes #3992 (Feature): dbNameQfq & dbNameData already implemented. dbNameT3 renamed from T3_DB_NAME. No more configuration in config.qfq.php necessary. Manual updated.
AbstractException.php: fixes access to uninitialized array elements.
Download.php: get dbT3 now from STORE_SYSTEM
Config.php: read 'dbNameT3' from TYPO3_CONF_VARS or from T3 config file.
QuickFormQuery.php: refactor gathering 'dbNames' - now from config.qfq.php. Fixes bug in getForwardMode() for QFQ inline editing.

Fixes #7407: MariaDB / Ubuntu 18 complains about missing values if column of type TEXT isn't explicit specified in INSERT. New default for database.init=SET sql_mode = "NO_ENGINE_SUBSTITUTION"

Manual.rst: Change _Paged to _paged in FormEditor example. Remove description to never implemented <level>.db. Add report keyword description <dbIndex>.

F4906 Php Session Timeout: can be specified globally in configuration and per form. Affects only logged in FE User.

F4901: implement split with 'convert' (jpeg). Refactor chmod(), unlink(), rename(), rmdir(), copy() to use by QFQ version which throws an exception.

QFQ now recommends ImageMagick instead of GraphicsMagic, due to much better 'convert' quality by converting 'svg' images.

QFQ now recommends ImageMagick instead of GraphicsMagic, due to much better 'convert' quality by converting 'svg' images.

F5112 - Add incompatibility warning for encode specialchar and checkType allbut… - change: no warning, allow '&'. This makes more sense than throwing a warning and forcing the use to switch to encoding='NONE'.

F6991 / Optional process 'readonly' FE during save. New FE parameter 'processReadOnly = 0|1'. refs #6991. Fixes #6991.

Upload: rename 'chmod' to 'chmodFile'. Implement 'chmodDir'. Permissions applied for all new created directories.